Evaluation of differential gene expression in susceptible and resistant clinical isolates of Klebsiella pneumoniae by DNA microarray analysis

Clin Microbiol Infect. 2006 Sep;12(9):936-40. doi: 10.1111/j.1469-0691..01470.x.


DNA microarray technology was used to evaluate differential gene expression in a susceptible Klebsiella pneumoniae isolate and a resistant clinical derivative. Nineteen genes were up-regulated in the resistant isolate when compared with the susceptible isolate. An ABC transporter-related gene, ycjV, was strongly over-expressed, suggesting the existence of a novel active efflux mechanism. Approximately half of the up-regulated genes coded for ribosomal proteins, or proteins involved in tRNA metabolism. Among 33 downregulated genes, almost one-third were related to nitrogen metabolism. A possible role of fitness in the development of antimicrobial resistance is suggested.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / pharmacology*
  • Bacterial Proteins / genetics*
  • Bacterial Proteins / metabolism
  • Drug Resistance, Bacterial*
  • Gene Expression Profiling
  • Gene Expression Regulation, Bacterial*
  • Humans
  • Klebsiella pneumoniae / drug effects*
  • Klebsiella pneumoniae / genetics
  • Klebsiella pneumoniae / isolation & purification
  • Klebsiella pneumoniae / metabolism*
  • Microbial Sensitivity Tests
  • Oligonucleotide Array Sequence Analysis / methods*
  • Transcription, Genetic


  • Anti-Bacterial Agents
  • Bacterial Proteins